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Merge pull request kubernetes#5288 from derekwaynecarr/namespace_life…
…cycle NamespaceLifecycle admission control plugin
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/* | ||
Copyright 2015 Google Inc. All rights reserved. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package lifecycle | ||
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import ( | ||
"fmt" | ||
"io" | ||
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"github.com/GoogleCloudPlatform/kubernetes/pkg/admission" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/api" | ||
apierrors "github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/client" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/client/cache" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/fields" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/labels" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/watch" | ||
) | ||
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func init() { | ||
admission.RegisterPlugin("NamespaceLifecycle", func(client client.Interface, config io.Reader) (admission.Interface, error) { | ||
return NewLifecycle(client), nil | ||
}) | ||
} | ||
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// lifecycle is an implementation of admission.Interface. | ||
// It enforces life-cycle constraints around a Namespace depending on its Phase | ||
type lifecycle struct { | ||
client client.Interface | ||
store cache.Store | ||
} | ||
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func (l *lifecycle) Admit(a admission.Attributes) (err error) { | ||
if a.GetOperation() != "CREATE" { | ||
return nil | ||
} | ||
defaultVersion, kind, err := latest.RESTMapper.VersionAndKindForResource(a.GetResource()) | ||
if err != nil { | ||
return err | ||
} | ||
mapping, err := latest.RESTMapper.RESTMapping(kind, defaultVersion) | ||
if err != nil { | ||
return err | ||
} | ||
if mapping.Scope.Name() != meta.RESTScopeNameNamespace { | ||
return nil | ||
} | ||
namespaceObj, exists, err := l.store.Get(&api.Namespace{ | ||
ObjectMeta: api.ObjectMeta{ | ||
Name: a.GetNamespace(), | ||
Namespace: "", | ||
}, | ||
}) | ||
if err != nil { | ||
return err | ||
} | ||
if !exists { | ||
return nil | ||
} | ||
namespace := namespaceObj.(*api.Namespace) | ||
if namespace.Status.Phase != api.NamespaceTerminating { | ||
return nil | ||
} | ||
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name := "Unknown" | ||
obj := a.GetObject() | ||
if obj != nil { | ||
name, _ = meta.NewAccessor().Name(obj) | ||
} | ||
return apierrors.NewForbidden(kind, name, fmt.Errorf("Namespace %s is terminating", a.GetNamespace())) | ||
} | ||
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func NewLifecycle(c client.Interface) admission.Interface { | ||
store := cache.NewStore(cache.MetaNamespaceKeyFunc) | ||
reflector := cache.NewReflector( | ||
&cache.ListWatch{ | ||
ListFunc: func() (runtime.Object, error) { | ||
return c.Namespaces().List(labels.Everything()) | ||
}, | ||
WatchFunc: func(resourceVersion string) (watch.Interface, error) { | ||
return c.Namespaces().Watch(labels.Everything(), fields.Everything(), resourceVersion) | ||
}, | ||
}, | ||
&api.Namespace{}, | ||
store, | ||
0, | ||
) | ||
reflector.Run() | ||
return &lifecycle{ | ||
client: c, | ||
store: store, | ||
} | ||
} |
80 changes: 80 additions & 0 deletions
80
plugin/pkg/admission/namespace/lifecycle/admission_test.go
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@@ -0,0 +1,80 @@ | ||
/* | ||
Copyright 2015 Google Inc. All rights reserved. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package lifecycle | ||
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import ( | ||
"testing" | ||
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"github.com/GoogleCloudPlatform/kubernetes/pkg/admission" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/api" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/client" | ||
"github.com/GoogleCloudPlatform/kubernetes/pkg/client/cache" | ||
) | ||
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// TestAdmission | ||
func TestAdmission(t *testing.T) { | ||
namespaceObj := &api.Namespace{ | ||
ObjectMeta: api.ObjectMeta{ | ||
Name: "test", | ||
Namespace: "", | ||
}, | ||
Status: api.NamespaceStatus{ | ||
Phase: api.NamespaceActive, | ||
}, | ||
} | ||
store := cache.NewStore(cache.MetaNamespaceIndexFunc) | ||
store.Add(namespaceObj) | ||
mockClient := &client.Fake{} | ||
handler := &lifecycle{ | ||
client: mockClient, | ||
store: store, | ||
} | ||
pod := api.Pod{ | ||
ObjectMeta: api.ObjectMeta{Name: "123", Namespace: namespaceObj.Namespace}, | ||
Spec: api.PodSpec{ | ||
Volumes: []api.Volume{{Name: "vol"}}, | ||
Containers: []api.Container{{Name: "ctr", Image: "image"}}, | ||
}, | ||
} | ||
err := handler.Admit(admission.NewAttributesRecord(&pod, namespaceObj.Namespace, "pods", "CREATE")) | ||
if err != nil { | ||
t.Errorf("Unexpected error returned from admission handler: %v", err) | ||
} | ||
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// change namespace state to terminating | ||
namespaceObj.Status.Phase = api.NamespaceTerminating | ||
store.Add(namespaceObj) | ||
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// verify create operations in the namespace cause an error | ||
err = handler.Admit(admission.NewAttributesRecord(&pod, namespaceObj.Namespace, "pods", "CREATE")) | ||
if err == nil { | ||
t.Errorf("Expected error rejecting creates in a namespace when it is terminating") | ||
} | ||
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// verify update operations in the namespace can proceed | ||
err = handler.Admit(admission.NewAttributesRecord(&pod, namespaceObj.Namespace, "pods", "UPDATE")) | ||
if err != nil { | ||
t.Errorf("Unexpected error returned from admission handler: %v", err) | ||
} | ||
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// verify delete operations in the namespace can proceed | ||
err = handler.Admit(admission.NewAttributesRecord(nil, namespaceObj.Namespace, "pods", "DELETE")) | ||
if err != nil { | ||
t.Errorf("Unexpected error returned from admission handler: %v", err) | ||
} | ||
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} |